Reamer



Dec. 26, 1944. G. 1. EAGLESON REAMER Filed Feb. 5, 1944 INVENTOR George I. Eaglesm'z %MMJ Patented Dec. 26, 1944 UNITED STATES PATENT OFFICE REAMER Ge'orge'I. Eagleson, Gambridge,,0hio Application February 5, 1944, Serial No. 521,185

.6 Claims.

Thisinvention is an improvement" in' reamers of the adjustable or expanding cutter type. It has for its object to improve the efiiciency of the reamer by utilizing a plurality of bits or cutters, each of which is longitudinally and rotatablyadjustable, whereby to provide successively a new zone of action, by means of an annular series'of longitudinal, preferably spiral, cutting teeth.

Also included are means whereby the entire set of bits may be individually rotated in their housing, with means for tightening and loosening the bits, and other features and elementsin'combinationtherewith, as shall be hereinafter more fully described.

Referring to the drawing show-ing'onepreferred embodiment of the invention:

Fig. 1 is a side view-inelevation of a complete reamer.

Fig. 2 is a detail View of the supporting spindle.

Fig; 3 is a partial side View like Fig. 1, ma different position.

Fig. 4 is a cross section onthe line IVIV of Fig. 3'.

Fig; 51s a cross section on theline V-V of Fig. 3.

Fig. 6 is adetail view in'perspective of one of the bits.

The reamer as a whole is provided with a standard central cylindrical spindle or bar 2. Such bar extends between opposite ends, provided with threads 3 and 4, and has a, middle enlarged integral housing portion The housing is provided with an even numbered series of longitudinal channels orgrooves 6, between radially extending equally spaced solid rib portions l6, both preferably tapered for reception of the series of bits 8. I

By such arrangement, the bits are adjustable longitudinally and at varying inclined positions, between minimum and maximum adjustments, as desired.

The bits as shown, are each provided with annularly arranged series of spirally arranged teeth 9, and as in Fig. 1, alternating bits are reversed, although the invention is. not limited to such arrangement. Beyond the housing 5, towards one end of the main shank or spindle 2, is a sleeve 10' having an inner annular series of rectangular sockets l I. Beyond the sleeve I0 is a spiral spring I2 subject to inward pressure of a nut l3, threaded on portion 3 of the spindle. 4

The collar Illa of a similar sleeve [4, integral therewith, confronts the opposite end of the housing, the'sleeve having threaded engagement with the portion 4. It may be rotated for tightening spon-ding series'ofpartition portions IE.

or loosening by a wrench, engaging'fiattened por tion' I5. The bit-receiving grooves 6- extend lengthwise of the housing between the corre- The groves, and their groove-defining partitions, con-- form generally'to a slightly diminishing taper towards the entering end of the reamer; as desired; depending on conditionsof work.

Conformably to such conditions, the bits are of suflicient length for ultimate desired adjustment between the opposing sleeve 10 and'collar [0a, of sleeve I4. 1

Each bit is provided at one end with a square or other suitable form of terminal 11, engageable with a corresponding socket ll of sleeve 10, for holding the bitfand all of the bits, in fixed relation to and position on the housing, as it is rotated.

At the opposite end, each bit is. provided with a coniform point l8 engageabl'e against the annularly V-grooved end, as at I012, of the inwardly adjustable collar [0a of sleeve 14, bythread engagement 4.

A supplemental alinement sleeve [9, tapered as shown; is" telescoped over the reduced cylindrical extension of sleeve l4,'and abuts against the collar portion Illa thereof,as shown.

As thus constructed, the several bits of the seriesmay be accurately adjusted longitudinally to the desired position; by adjustment of the threaded nut l3 and sleeve l4.

By tapering the several grooves 6, thebits 8 may be caused to assume a tapering group formation in the housing, whether the bits themselves be either tapered or straight. Preferably, the bits with their series of spiral teeth, are themselves tapered as shown, it being understood that With either arrangement, the degree of taper in either or both, is a matter of adjustment and degree, in adapting the reamer to its intended work.

By reason of the construction shown, each bit will be firmly held fixedly in position on the housing by the stud l1 and socket ll engagement with collar I0, and between same and opposite collar [011. Also, by adjusting said members towards or from each other, the series of bits may be correspondingly moved lengthwise to exact location desired. Adjustment rotation of sleeve l4 and its collar Illa. and its groove lflb provides annular bearing for the coniform terminals I8.

A further and important advantage is in the facility with which either bit, or all together, may be removed and rotated, say one quarter revolution, and again replaced. Thus worn teeth may be removed from active position, and replaced by the next annular unused teeth, thereby enlarging the cutting capacity of each bit at least four times. The increased utilization of the reamer in this manner not only enlarges its life efliciency, but also ensures consistently accurate work at all times.

While ordinarily the direction of the spiral teeth may be uniform throughout the series clockwise, the direction of the spirals may likewise be reversed if desired, as inFig. 1, thereby avoiding any tendency to chatter and ensuring uniform consistently good work.

The tool being assembled for use in reaming a hole, and properly adjusted as to diameter of the path of rotation of the reaming bits, and with sufilcient endwise holding of the parts, the entire reamer may be rotated by a suitable tool or wrench engaging the squared end 20 of shank 2.

While in the drawing four individual bits are shown, the number may be increased or reduced,

preferably in multiples of two, to any practicable extent, dependent on size or other limitations.

The construction of the reamer and its manner of use will be clearly understood and appreciated by those familiar with the art. It may be changed or varied in detail construction by the skilled mechanic to adapt it to varying conditions of use, within the scope of the following claims.

I claim: 1. In a reamer as described, the combination with a central supporting bar having terminal threaded portions and an intermediate grooved housing, of a plurality of peripherally circular bits each having a terminal rotating extension at one end, a bearing point extension at the other end, and a pair of sleeves each surrounding the bar and engaging said terminals oppositely, and means having screw engagement with said threaded portions of the bar for urging either of said sleeves towards the housing.

2. In a reamer as described, the combination with a central supporting bar having terminal threaded portions and an intermediate grooved housing, of a plurality of bits mounted in the housing each having a rotation holding and a free bearing portion at opposite ends, a sleeve on the bar having sockets for the holding portions and a coacting spring and adjusting nut, and a sleeve threaded 0n the bar engaging the free bearing portions of the bits.

3. The combination with a bar having a housing between its ends provided with longitudinal grooves, a plurality of spiral tooth bits mounted in the grooves for adjustment therein each having a rotation holding portion at one end and a free bearing portion at the other end, a sleeve on the bar having sockets for the holding portions of the bits, a spring, a nut therefor threaded on the bar, and a sleeve adjustable on the bar having an annular groove engaging the free bearing portions of the bits.

4. In a reamer as described, the combination with a central supporting bar having terminal threaded portions and an intermediate grooved housing, of a plurality of peripherally circular bits each having a terminal rotating extension at one end and a bearing point extension at the other end, an adjusting and rotating sleeve on the bar having sockets for the rotating extensions, and an oppositely disposed sleeve on the bar having a terminal provided with an annular groove engageable with said bearing point extensions.

5. In a reamer as described, the combination with a central supporting bar having terminal threaded portions and an intermediate grooved housing, of a plurality of peripherally circular bits each having a terminal rotating extension at one end and a bearing point extension at the other end, an adjusting and rotating sleeve on the bar having sockets for the rotating extensions, and an oppositely disposed sleeve threaded on the bar having a terminal provided with an annular groove engageable with said bearing point extensions.

6. In a reamer as described, the combination with a central supporting bar having terminal threaded portions and an intermediate grooved housing, of a'plurality of peripherally circular bits each having a terminal rotating extension at one end and a bearing point extension at the other end, an adjusting and rotating sleeve on the bar having sockets for the rotating extensions, an oppositely disposed sleeve threaded on the bar having a terminal provided with an annular groove engageable with said bearing point extensions, and an alinement sleeve telescoped over said sleeve.

GEORGE I. EAGLESON. 

